I have always found the concept of "luck" to be challenging. Part of me is inclined to think that there really is no such thing (at least not in the sense that we normally conceive it) - that in reality, luck is a concept we use when we simply do not know the underlying mechanisms of some phenomena.
I think that luck is a much problematic concept than we generally think. I say this because I believe that the human mind essentially requires that some kind of mechanism be responsible for the outcome of any and all events. In other words, I think that "luck", the idea that the outcome of an event has an element of randomness, is a concept that we use but, deep inside, we cannot help but think it is an approximation, a temporary fix to cover our ignorance.
I am aware of the significant role that randomness plays in quantum physics. I still think the concept is problematic - "random chance" is a concept we can never be comfortable with, precisely because it clashes with the way our minds work. And here I want to draw an important distinction. I am not saying that luck is a workable concept that we, by virtue of our commitment to mechanistic explanation, have yet to adopt. I am saying something much stronger: that the necessary conditions to allow us to make sense of the world simply preclude the intelligibility of the concept of luck.